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7 | Electrical connection
7
Electrical connection
DANGER
ATTENTION When attaching accessories with an electrical cable, a minimum
INFO
7.1 Information for contactor and motor contactor selection
All protection equipment, switching and monitoring devices must comply with the local safety regula-
tions and established specifications (e.g. VDE) and regulations as well as the manufacturer's speci-
fications. Motor protection switches are required! Motor contactors, feed lines, fuses and motor
protection switches must be rated according to the maximum operating current (see name plate).
For motor protection, use a current-independent, time-delayed overload protection device for monitor-
ing all three phases. Adjust the overload protection device so that it must be actuated within 2 hours
at 1.2 times the maximum working current.
7.2 Standard motor, design for direct or part winding start
Designation on the name plate
Y/YY
Compressors with this marking are suitable for direct or partial winding start. The motor winding is
subdivided into two parts: Part winding 1 = 50% and part winding 2 = 50%. This winding division
reduces the start-up current needed for a part winding start to approx. 50% of that for a direct start.
INFO
Risk of electric shock! High voltage!
Only carry out work when the electrical system is disconnected
from the power supply!
bending radius of 3 x the cable diameter must be maintained for
laying the cable.
Connect the compressor motor in accordance with the circuit diagram
(see inside of terminal box).
Use suitable cable entry point of the correct protection type (see
name plate) for routing cables into the terminal box. Insert the strain
reliefs and prevent chafe marks on the cables.
Compare the voltage and frequency values with the data for the
mains power supply.
Only connect the motor if these values are the same.
A mechanical unloaded start with bypass solenoid valve is
not required.
D
GB
F
E
17
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